Creating a Blueberry Crumble Cheesecake is a step-by-step process, but each step is simple and straightforward. Follow these instructions for an incredible outcome:

1. Preheat your oven to 325°F (160°C). Prepare a 9-inch springform pan by lightly greasing it or lining it with parchment paper.
2. Make the crust: In a medium bowl, combine graham cracker crumbs, melted butter, sugar, and cinnamon. Mix until well blended. Press this mixture evenly into the bottom of the prepared pan. Bake for 10 minutes, then remove from the oven and set aside.
3. Prepare the filling: In a large bowl, beat the softened cream cheese until smooth using an electric mixer. Gradually add the sugar and vanilla extract, mixing until combined.
4. Add the eggs one at a time, mixing on low speed until just combined. Do not overmix. Then, fold in the sour cream gently until smooth.
5. Add blueberries: Carefully mix in the fresh or frozen blueberries until evenly distributed. Pour the filling over the baked crust in the springform pan.
6. Bake the cheesecake for 45-55 minutes or until the center is set, but still slightly jiggly. The edges should look firm.
7. Turn off the oven and crack open the oven door, allowing the cheesecake to cool in the oven for about an hour. This helps prevent cracking.
8. Remove from the oven and refrigerate the cheesecake for at least 2 hours or overnight for optimal results.
9. Prepare the crumble topping: In a separate bowl, combine rolled oats, flour, brown sugar, softened butter, and cinnamon. Mix until crumbly.
10. Once the cheesecake has cooled, sprinkle the crumble topping evenly over the top.
11. Return it to the oven and bake for an additional 15-20 minutes, until the topping is golden brown.
12. Let cool completely before slicing. Garnish with more blueberries if desired.

Following these steps will guide you in creating an astonishing Blueberry Crumble Cheesecake that not only pleases the palate but also dazzles the eyes.